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Contrast Sensitivity Measurements, Interpretation and Modifications Karen Squier, OD, FAAO Chicago, IL August 13, 2011

Goals . Review types of contrast sensitivity tests and their measurementsDiscuss how contrast sensitivity tests should be interpretedDiscuss environmental and patient centered modifications. Vision. Ability to see detailTypically measured with high contrast chartsSnellen most common test in prim

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Contrast Sensitivity Measurements, Interpretation and Modifications Karen Squier, OD, FAAO Chicago, IL August 13, 2011

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    1. Contrast Sensitivity Measurements, Interpretation and Modifications Karen Squier, OD, FAAO Chicago, IL August 13, 2011 AER Conference, Boston

    2. Goals Review types of contrast sensitivity tests and their measurements Discuss how contrast sensitivity tests should be interpreted Discuss environmental and patient centered modifications

    3. Vision Ability to see detail Typically measured with high contrast charts Snellen most common test in primary care Projected charts or computer generated Test is typically given at 20 foot distance or equivalent

    4. Vision Using visual acuity charts measures ability of patient to see details Good measurement of spectacle blur Does not give functional or descriptive picture of how well patient sees

    5. Vision Visual acuity is a valuable measurement Measures disease progression Assists in determining magnification Helps determine devices useful for goal print Determines disability 20/200 visual acuity equates to legally blind status 20/70 visual acuity equates to visual impairment Useful measure in uncovering spectacle blur

    6. Vision Despite good visual acuity patients may still have complaints that far outweigh their performance on acuity testing Poor mobility Difficulty with facial recognition Problems with glare

    7. Visual acuity Functionally, does not assess patients performance in real life situations Ability to navigate safely in a movie theatre compared to supermarket Ability to appreciate print on a black board in a class room with overhead lights compared to a class room with additional lighting from windows

    8. Vision

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